The use of supersonic flame spraying technology provides surface strengthening and functional coatings for the medium and low temperature furnace rollers, outdoor process rollers (tension rollers, turning rollers, correction rollers, pinch rollers, etc.), sinking rollers, stabilizing rollers, and other rollers on the continuous annealing line (CAL) and hot-dip galvanizing line (CGL) of steel mills, effectively extending the service life of various roller bodies and providing strong guarantees for the stable operation of production lines. This technology has been successfully applied in Ma Steel, Han Steel, Lian Steel, Xin Steel, Tang Steel, and foreign steel mills.

Supersonic flame spraying technology (HVOF) is a technology that uses fuel (hydrogen, propane, propylene, or aviation kerosene, etc.) and high-pressure oxygen to mix and burn vigorously in a combustion chamber, generating a stable high-pressure high-speed flame flow. When it passes through a specially designed Laval nozzle, it accelerates into a supersonic flame flow. It heats and accelerates the powder particles fed into the flame flow, causing the particles to collide with the surface of the workpiece substrate at high speed in a molten or semi molten state to form a coating. By selecting the best spraying materials and adopting optimized spraying processes, Cr3C2 series metal ceramic coatings with high temperature oxidation resistance, high temperature wear resistance, and corrosion resistance can be prepared for furnace rollers; Provide wear-resistant and corrosion-resistant WC based metal ceramic coating for the process rollers outside the furnace; At the same time, it can provide special metal ceramics that are resistant to molten metal corrosion and corrosion wear for components such as zinc pot sinking rollers.